U.S. patent application number 16/110467 was filed with the patent office on 2019-08-15 for electronic paper display screen, method for driving the same, and electronic paper display device.
The applicant listed for this patent is BOE Technology Group Co., Ltd., Chengdu BOE Optoelectronics Technology Co., Ltd.. Invention is credited to Junping Bao, Dongwang Jia, Xinghua Li, Bing Xu.
Application Number | 20190250481 16/110467 |
Document ID | / |
Family ID | 62865397 |
Filed Date | 2019-08-15 |
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United States Patent
Application |
20190250481 |
Kind Code |
A1 |
Xu; Bing ; et al. |
August 15, 2019 |
ELECTRONIC PAPER DISPLAY SCREEN, METHOD FOR DRIVING THE SAME, AND
ELECTRONIC PAPER DISPLAY DEVICE
Abstract
An electronic paper display screen, a method for driving the
same, and an electronic paper display device are provided. The
electronic paper display screen comprising: a first substrate and a
second substrate opposite to each other; a plurality of insulating
barrier walls dividing a space between the first substrate and the
second substrate into a plurality of closed chambers; a plurality
of first transparent electrodes, each of which is disposed on the
first substrate and is located at a position corresponding to each
of the closed chambers; a plurality of second electrodes, each of
which is located in each of the closed chambers and is disposed on
a sidewall of the insulating barrier walls; and a plurality of
black charged particles which are disposed within each of the
closed chambers and move under effect of an electric field.
Inventors: |
Xu; Bing; (Beijing, CN)
; Jia; Dongwang; (Beijing, CN) ; Bao; Junping;
(Beijing, CN) ; Li; Xinghua; (Beijing,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
BOE Technology Group Co., Ltd.
Chengdu BOE Optoelectronics Technology Co., Ltd. |
Beijing
Chengdu |
|
CN
CN |
|
|
Family ID: |
62865397 |
Appl. No.: |
16/110467 |
Filed: |
August 23, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H05B 47/11 20200101;
G02F 1/133512 20130101; G02F 2001/133618 20130101; G02F 2201/121
20130101; H02S 99/00 20130101; G02F 1/133606 20130101; G02F 1/13439
20130101; G02F 1/1676 20190101; G02B 6/0068 20130101; G02F 1/167
20130101; G02F 1/13394 20130101; G02F 2001/133612 20130101; G02F
1/1681 20190101 |
International
Class: |
G02F 1/167 20060101
G02F001/167; G02F 1/1339 20060101 G02F001/1339; F21V 8/00 20060101
F21V008/00; G02F 1/1335 20060101 G02F001/1335; G02F 1/1343 20060101
G02F001/1343; H05B 37/02 20060101 H05B037/02 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 13, 2018 |
CN |
201810150681.8 |
Claims
1. An electronic paper display screen comprising: a first substrate
and a second substrate opposite to each other; a plurality of
insulating barrier walls dividing a space between the first
substrate and the second substrate into a plurality of closed
chambers; a plurality of first transparent electrodes, each of
which is disposed on the first substrate and is located at a
position corresponding to each of the closed chambers; a plurality
of second electrodes, each of which is located in each of the
closed chambers and is disposed on a sidewall of the insulating
barrier walls; and a plurality of black charged particles which are
disposed within each of the closed chambers and move under effect
of an electric field.
2. The electronic paper display screen according to claim 1,
further comprising first connecting electrodes which are disposed
on the first substrate and are configured to electrically
interconnect the plurality of first transparent electrodes.
3. The electronic paper display screen according to claim 1,
further comprising first connecting electrodes which are disposed
on the insulating barrier walls and are configured to electrically
interconnect the plurality of second electrodes.
4. The electronic paper display screen according to claim 3,
wherein the first connecting electrodes are configured to
electrically interconnect the plurality of second electrodes across
a side of the insulating barrier walls close to the first substrate
or across a side of the insulating barrier walls close to the
second substrate.
5. The electronic paper display screen according to claim 1,
further comprising a plurality of third transparent electrodes on
the second substrate, each of the third transparent electrodes
being disposed at a position corresponding to each of the closed
chambers.
6. The electronic paper display screen according to claim 5,
wherein the plurality of the first transparent electrodes are
independent of each other; and wherein the electronic paper display
screen further comprises second connecting electrodes which are
disposed on the second substrate and are configured to electrically
interconnect the plurality of the third transparent electrodes.
7. The electronic paper display screen according to claim 1,
wherein material of the insulating barrier walls is a light
shielding material.
8. The electronic paper display screen according to claim 7,
further comprising a light shielding pattern on the first substrate
or the second substrate, and a projection of the insulating barrier
walls on the light shielding pattern is located within boundary of
the light shielding pattern.
9. The electronic paper display screen according to claim 1,
wherein the sidewall of the insulating barrier walls, on which the
second electrode is disposed, has an inclined surface or an
inwardly recessed surface.
10. The electronic paper display screen according to claim 1,
further comprising transparent liquid within each of the closed
chambers, wherein the black charged particles are movable in the
transparent liquid.
11. An electronic paper display device comprising the electronic
paper display screen according to claim 1 and a backlight assembly,
wherein the backlight assembly comprises a power supply module and
main light sources connected to the power supply module, and the
power supply module is configured to supply power to the main light
sources so that the main light sources provide the electronic paper
display screen with backlight when being charged.
12. The electronic paper display device according to claim 11,
wherein the power supply module comprises a photoelectric
conversion component configured to absorb an external light and
convert the absorbed external light into electrical energy to
supply power to the main light sources.
13. The electronic paper display device according to claim 11,
wherein the backlight assembly further comprises at least one
auxiliary light source; wherein the auxiliary light source
comprises an optical collector and an optical transmission channel;
and wherein the optical collector is disposed at an entrance of the
optical transmission channel and is configured to concentrate and
transmit the external light into the optical transmission channel,
and the optical transmission channel is configured to transmit the
external light entering at the entrance thereof to an exit of the
optical transmission channel.
14. The electronic paper display device according to claim 13,
wherein the auxiliary light source further comprises a diffuse
reflector at the exit of the optical transmission channel.
15. The electronic paper display device according to claim 13,
wherein a concentrating port of the optical collector for
concentrating the external light is arranged to face towards a
display side of the electronic paper display device.
16. The electronic paper display device according to claim 13,
wherein the optical transmission channel is a fiber tube or a
one-dimensional defect photonic transistor.
17. The electronic paper display device according to claim 13,
wherein the optical transmission channel comprises a transmission
tube and a reflective layer within the transmission tube.
18. The electronic paper display device according to claim 13,
wherein the backlight assembly further comprises a photosensitive
module configured to sense an intensity of the external light or
configured to sense an intensity of the external light concentrated
by the auxiliary light source; and a control module configured to
control the power supplied by the power supply module based on the
intensity of the external light sensed by the photosensitive
module.
19. A method for driving the electronic paper display screen
according to claim 1, wherein an electric field configured to drive
a movement of the black charged particles in each of the closed
chambers is generated by the first transparent electrode and the
second electrode in each of the closed chambers, the driving method
comprising steps of: applying voltages to the first transparent
electrode and the second electrode; and controlling the black
charged particles to move towards the first substrate through the
electric field generated by the first transparent electrode and the
second electrode so as to enable each of the closed chambers to
display a black state, or controlling the black charged particles
to move towards the second electrode through the electric field
generated by the first transparent electrode and the second
electrode so as to enable each of the closed chambers to display a
white state.
20. A method for driving the electronic paper display screen
according to claim 5, wherein an electric field configured to drive
a movement of the black charged particles in each of the closed
chambers is generated by the first transparent electrode, the
second electrode and the third transparent electrode in each of the
closed chambers, the driving method comprising steps of: applying
voltages to the first transparent electrode, the second electrode
and the third transparent electrode; and controlling a direction of
the electric field configured to drive the movement of the black
charged particles in each of the closed chambers by controlling
voltages of the first transparent electrode, the second electrode
and the third transparent electrode, so as to drive the black
charged particles to move towards the first substrate or the second
substrate such that each of the closed chambers displays a black
state, or to drive the black charged particles to move towards the
second electrode such that each of the closed chambers displays a
white state.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] The present disclosure claims the benefit of Chinese Patent
Application Disclosure No. 201810150681.8 filed on Feb. 13, 2018 in
the State Intellectual Property Office of China, the whole
disclosure of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
Field of the Invention
[0002] Embodiments of the present disclosure relate to the
technical field of display technology, and especially to an
electronic paper display screen, a method for driving the same, and
an electronic paper display device.
Description of the Related Art
[0003] Electronic paper (E-paper) technology has become more and
more popular among consumers because of its low energy consumption,
ability to maintain display in case of power off, and similar to
actual paper display.
[0004] However, display of the electronic paper display device in
the related art has to rely on an external light, and a contrast
and brightness of the electronic paper display device during a
display are substantially affected when the external light is not
sufficient, and the electronic paper display device cannot display
in a dark environment.
SUMMARY OF THE INVENTION
[0005] According an aspect of the present disclosure, there is
provided an electronic paper display screen comprising:
[0006] a first substrate and a second substrate opposite to each
other;
[0007] a plurality of insulating barrier walls dividing a space
between the first substrate and the second substrate into a
plurality of closed chambers;
[0008] a plurality of first transparent electrodes, each of which
is disposed on the first substrate and is located at a position
corresponding to each of the closed chambers;
[0009] a plurality of second electrodes, each of which is located
in each of the closed chambers and is disposed on a sidewall of the
insulating barrier walls; and
[0010] a plurality of black charged particles which are disposed
within each of the closed chambers and move under effect of an
electric field.
[0011] In an embodiment, the electronic paper display screen
further comprises first connecting electrodes which are disposed on
the first substrate and are configured to electrically interconnect
the plurality of first transparent electrodes.
[0012] In an embodiment, the electronic paper display screen
further comprises first connecting electrodes which are disposed on
the insulating barrier walls and are configured to electrically
interconnect the plurality of second electrodes.
[0013] In an embodiment, the first connecting electrodes are
configured to electrically interconnect the plurality of second
electrodes across a side of the insulating barrier walls close to
the first substrate or across a side of the insulating barrier
walls close to the second substrate.
[0014] In an embodiment, the electronic paper display screen
further comprises a plurality of third transparent electrodes on
the second substrate, each of the third transparent electrodes
being disposed at a position corresponding to each of the closed
chambers.
[0015] In an embodiment, the plurality of the first transparent
electrodes are independent of each other; and
[0016] wherein the electronic paper display screen further
comprises second connecting electrodes which are disposed on the
second substrate and are configured to electrically interconnect
the plurality of the third transparent electrodes.
[0017] In an embodiment, material of the insulating barrier walls
is a light shielding material.
[0018] In an embodiment, the electronic paper display screen
further comprises a light shielding pattern on the first substrate
or the second substrate, and a projection of the insulating barrier
walls on the light shielding pattern is located within boundary of
the light shielding pattern.
[0019] In an embodiment, the sidewall of the insulating barrier
walls, on which the second electrode is disposed, has an inclined
surface or an inwardly recessed surface.
[0020] In an embodiment, the electronic paper display screen
further comprises transparent liquid within each of the closed
chambers,
[0021] wherein the black charged particles are movable in the
transparent liquid.
[0022] According to another aspect of the present disclosure, there
is provided an electronic paper display device comprising the
electronic paper display screen according to claim 1 and a
backlight assembly,
[0023] wherein the backlight assembly comprises a power supply
module and main light sources connected to the power supply module,
and the power supply module is configured to supply power to the
main light sources so that the main light sources provide the
electronic paper display screen with backlight when being
charged.
[0024] In an embodiment, the power supply module comprises a
photoelectric conversion component configured to absorb an external
light and convert the absorbed external light into electrical
energy to supply power to the main light sources.
[0025] In an embodiment, the backlight assembly further comprises
at least one auxiliary light source;
[0026] wherein the auxiliary light source comprises an optical
collector and an optical transmission channel; and
[0027] wherein the optical collector is disposed at an entrance of
the optical transmission channel and is configured to concentrate
and transmit the external light into the optical transmission
channel, and the optical transmission channel is configured to
transmit the external light entering at the entrance thereof to an
exit of the optical transmission channel.
[0028] In an embodiment, the auxiliary light source further
comprises a diffuse reflector at the exit of the optical
transmission channel.
[0029] In an embodiment, a concentrating port of the optical
collector for concentrating the external light is arranged to face
towards a display side of the electronic paper display device.
[0030] In an embodiment, the optical transmission channel is a
fiber tube or a one-dimensional defect photonic transistor.
[0031] In an embodiment, the optical transmission channel comprises
a transmission tube and a reflective layer within the transmission
tube.
[0032] In an embodiment, the backlight assembly further comprises a
photosensitive module configured to sense an intensity of the
external light or configured to sense an intensity of the external
light concentrated by the auxiliary light source; and a control
module configured to control the power supplied by the power supply
module based on the intensity of the external light sensed by the
photosensitive module.
[0033] According to another aspect of the present disclosure, there
is provided a method for driving the electronic paper display
screen according to claim 1, wherein an electric field configured
to drive a movement of the black charged particles in each of the
closed chambers is generated by the first transparent electrode and
the second electrode in each of the closed chambers, the driving
method comprising steps of:
[0034] applying voltages to the first transparent electrode and the
second electrode; and
[0035] controlling the black charged particles to move towards the
first substrate through the electric field generated by the first
transparent electrode and the second electrode so as to enable each
of the closed chambers to display a black state, or controlling the
black charged particles to move towards the second electrode
through the electric field generated by the first transparent
electrode and the second electrode so as to enable each of the
closed chambers to display a white state.
[0036] In an embodiment, an electric field configured to drive a
movement of the black charged particles in each of the closed
chambers is generated by the first transparent electrode, the
second electrode and the third transparent electrode in each of the
closed chambers, the driving method comprising steps of:
[0037] applying voltages to the first transparent electrode, the
second electrode and the third transparent electrode; and
[0038] controlling a direction of the electric field configured to
drive the movement of the black charged particles in each of the
closed chambers by controlling voltages of the first transparent
electrode, the second electrode and the third transparent
electrode, so as to drive the black charged particles to move
towards the first substrate or the second substrate such that each
of the closed chambers displays a black state, or to drive the
black charged particles to move towards the second electrode such
that each of the closed chambers displays a white state.
BRIEF DESCRIPTION OF THE DRAWINGS
[0039] In order to more clearly illustrate the technical solutions
in the embodiment of the present disclosure or in the related art,
drawings to be used in the embodiments or in the related art
description will be briefly described below. Apparently, the
drawings in the following description are only some embodiments of
the present disclosure and other drawings may be obtained by those
skilled in the art without an inventive effort.
[0040] FIG. 1 is a schematic structural view of an electronic paper
display device in the related art;
[0041] FIG. 2 is a schematic structural diagram of an electronic
paper display screen according to an embodiment of the present
disclosure;
[0042] FIG. 3 is a schematic structural diagram of another
electronic paper display screen according to an embodiment of the
present disclosure;
[0043] FIG. 4 is a schematic structural diagram of yet another
electronic paper display screen according to an embodiment of the
present disclosure;
[0044] FIG. 5 is a schematic structural diagram of still another
electronic paper display screen according to an embodiment of the
present disclosure;
[0045] FIG. 6 is a schematic structural diagram of still another
electronic paper display screen according to an embodiment of the
present disclosure;
[0046] FIG. 7 is a schematic structural diagram of still another
electronic paper display screen according to an embodiment of the
present disclosure;
[0047] FIG. 8a is a schematic structural diagram of an electronic
paper display device according to another embodiment of the present
disclosure;
[0048] FIG. 8b is a schematic structural diagram of another
electronic paper display device according to another embodiment of
the present disclosure;
[0049] FIG. 9 is a schematic structural diagram of an auxiliary
light source according to an embodiment of the present
disclosure;
[0050] FIG. 10 is a schematic structural diagram of another
auxiliary light source according to an embodiment of the present
disclosure; and
[0051] FIG. 11 is a schematic diagram of a method for driving an
electronic paper display screen according to an embodiment of the
present disclosure.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
[0052] The technical solutions in the embodiment of the present
disclosure are clearly and completely described in the following
with reference to the accompanying drawings in the embodiment of
the present disclosure. Apparently, the described embodiments are
only some of the embodiments of the present disclosure, and are not
all of the embodiments. All other embodiments obtained by a person
of ordinary skill in the art based on the embodiment of the present
disclosure without paying an inventive effort will fall within the
scope of the present disclosure.
[0053] A structure of the electronic paper display device in the
related art is shown in FIG. 1. A basic principle of the electronic
paper display is that negatively charged white particles 301 and
positively charged black particles 302 are controlled to move in
transparent liquid 303 by an electric field generated by an upper
electrode 10 and a lower electrode 20, and when the white particles
301 move upward, as the white particles 301 reflect an external
light towards human eyes, a white state is displayed; when the
black particles 302 move upward, as the black particles 302 absorb
an external light, a black state is displayed.
[0054] According to a general inventive concept of the present
disclosure, there is provided an electronic paper display screen
comprising: a first substrate and a second substrate opposite to
each other; a plurality of insulating barrier walls dividing a
space between the first substrate and the second substrate into a
plurality of closed chambers; a plurality of first transparent
electrodes, each of which is disposed on the first substrate and is
located at a position corresponding to each of the closed chambers;
a plurality of second electrodes, each of which is located in each
of the closed chambers and is disposed on a sidewall of the
insulating barrier walls; and a plurality of black charged
particles which are disposed within each of the closed chambers and
move under effect of an electric field.
[0055] An embodiment of the present disclosure provides an
electronic paper display screen, as shown in FIG. 2, comprising: a
first substrate 40 and a second substrate 50 disposed opposite to
each other; a plurality of insulating barrier walls 60 dividing a
space between the first substrate 40 and the second substrate 50
into a plurality of closed chambers distributing in a direction
perpendicular to a thickness of the electronic paper display
screen; the first substrate 40 comprising a plurality of first
transparent electrodes 401, each of which is located at a position
corresponding to each of the closed chambers; the electronic paper
display screen further comprises a plurality of second electrodes
601, each of which is located in each of the closed chambers and is
disposed on a sidewall of the insulating barrier walls 60; a
plurality of black charged particles 70 disposed within each of the
closed chambers and moved under effect of an electric field.
[0056] It may be noted that, as shown in FIG. 2, the first
substrate 40 may comprise a first base substrate 402 on which the
plurality of first transparent electrodes 401 are disposed.
[0057] Each of the first electrodes 401 is located at a position
corresponding to each of the closed chambers, taking a placement
orientation of the electronic paper display screen in FIG. 2 as an
example, that is, each of the first electrodes 401 is located above
each of the closed chambers. Here, since the insulating barrier
walls 60 divide the space so as to form the closed chambers,
respectively, when each of the first electrodes 401 is located at
the position corresponding to each of the closed chambers, a
projection of each of the first electrodes 401 on the first base
substrate 402 may or may not overlap with a projection of each of
the insulating barrier walls 60 on the first base substrate
402.
[0058] In addition, each of the second electrodes 601 may be formed
by directly coating a conductive film layer or by depositing a
conductive film layer in way of vapor deposition on an sidewall of
the insulating barrier walls 60 in each of the closed chambers;
alternatively, each of the second electrodes 601 may be formed by
attaching an electrode plate onto an sidewall of the insulating
barrier walls 60 in each of the closed chambers.
[0059] Each of the closed chambers is surrounded and closed by the
first substrate 40, the second substrate 50, and adjacent four
insulating barrier walls 60. Each of the second electrodes 601 may
be disposed on a partial of the area or entire area of sidewalls of
insulating barrier walls 60 of each of the closed chambers. For
example, if each of the closed chambers surrounded by the
insulating barrier walls 60 is in a cube form, the second electrode
601 may be disposed on one side surface of the cube, alternatively,
the second electrode 601 may be disposed on two or more side
surfaces of the cube.
[0060] Further, the black charged particles 70 may be positively
charged or negatively charged, which is not limited herein. A
material of the black charged particles 70 is not limited here, and
it may be, for example, a black resin doped with charged
particles.
[0061] Further, a moving direction of the black charged particles
70 in each of the closed chambers is related to a direction of the
electric field that drives the black charged particles 70 in each
of the closed chambers to move as well as positivity or negativity
of charges of the black charged particles 70. Specifically, when
black charged particles 70 in a closed chamber move under an
electric field only generated by a first electrode 401 and a second
electrode 601, taking the black charged particles 70 being
positively charged as an example, if a voltage applied to the first
electrode 401 is higher than a voltage applied to the second
electrode 601, the direction of the electric field is directed from
the first electrode 401 to the second electrode 601, and the black
charged particles 70 move towards the second electrode 601; if the
voltage applied to the first electrode 401 is lower than the
voltage applied to the second electrode 601, the direction of the
electric field is directed from the second electrode 601 to the
first electrode 401, the black charged particles 70 move towards
the first substrate 40.
[0062] In addition, the electronic paper display screen provided by
the embodiment of the present disclosure is supposed to be used in
combination with a backlight assembly capable of providing a
backlight for the electronic paper display screen.
[0063] The display principle of the electronic paper display screen
is as follows: one closed chamber in the electronic paper display
screen is equivalent to a sub-pixel, and the black charged
particles 70 in each of the closed chambers are controlled to move
therein by controlling the direction of the electric field that
drives the black charged particles 70 in each of the closed
chambers to move, so as to achieve a purpose of controlling each of
the closed chambers to achieve a black state or a white state
display. When the black charged particles 70 in the closed chamber
move towards the first substrate 40 under the effect of the
electric field (as shown in the closed chamber on the left side of
FIG. 2), in this way, the black charged particles 70 block the
light emitted from the backlight assembly. Thus, the backlight
provided by the backlight assembly fails to be incident into the
human eyes through the closed chamber so as to achieve a black
state display; when the black charged particles 70 in the closed
chamber move towards the second electrode 601 under the effect of
the electric field (as shown in the closed chamber on the right
side of FIG. 2), since the second electrode 601 is disposed on the
sidewall of the insulating barrier wall 60, the black charged
particles 70 move to the sidewall, in this way, the backlight
provided by the backlight assembly may be incident into the human
eyes through the closed chamber so as to achieve a white state
display.
[0064] An embodiment of the present disclosure provides an
electronic paper display screen. Since the electronic paper display
screen is used in combination with the backlight assembly, the
backlight assembly is used to provide the backlight for the
electronic paper display screen, compared with the fact that the
electronic paper display screen in related art emits light by a
reflection of the external light on surfaces of the white particles
301, the brightness and contrast of the electronic paper display
screen provided by the embodiment of the present disclosure are not
affected by the external light when the electronic paper display
screen displays, and the electronic paper display screen may
normally display when the external light is not sufficient or an
external environment is dark.
[0065] Based on the above, it may be noted that when the second
substrate 50 comprises a reflective layer, the electronic paper
display screen provided by the embodiment of the present disclosure
may also achieve display by using the external light to serve as a
light source, without the backlight assembly providing the
backlight, and the principle of the electric field driving the
black charged particles 70 in the closed chamber to move is the
same as above, and will not be described again here. When the black
charged particles 70 in the closed chamber move towards the first
substrate 40 or the second substrate 50, and the external light is
directed to the closed chamber, the black charged particles 70
absorb the external light to achieve the black state display; when
the black charged particles 70 in the closed chamber move towards
the second electrode 601, the external light is transmitted through
the first electrode 401 to the reflective layer, and is reflected
by the reflective layer into the human eyes, thereby realizing the
white state display.
[0066] Optionally, as shown in FIG. 3, the electronic paper display
screen further comprises first connecting electrodes 80 which are
configured to electrically interconnect the plurality of first
electrodes 401 or to electrically interconnect second electrodes
601 (in FIG. 3, first connecting electrodes 80 electrically
interconnecting the plurality of first electrodes 401 are taken as
an example).
[0067] When the plurality of first connection electrodes 80 is used
to electrically interconnect the plurality of first electrodes 401,
the plurality of first connection electrodes 80 and the plurality
of the first electrodes 401 may be disposed on one same base
substrate. On the basis of this, the first connection electrodes 80
and the first electrodes 401 may be formed simultaneously. When the
first connecting electrode 80 is used to electrically interconnect
the plurality of second electrodes 601, both the first connecting
electrode 80 and the plurality of second electrodes 601 may be
disposed on the insulating barrier walls 60, and the first
connecting electrodes 80 extend across a side of the insulating
barrier walls 60 close to the first substrate 40 or a side of the
insulating barrier walls 60 close to the second substrate 50 so as
to electrically interconnect adjacent second electrodes 601. On
this basis, those skilled in the art may understand that, when the
first connecting electrodes 80 are used to electrically
interconnect the plurality of second electrodes 601, it may be
noted when the first connecting electrodes 80 are disposed that, a
portion of the first connecting electrode 80 on a side of the
insulating barrier walls 60 close to the first substrate 40 or a
side of the insulating barrier walls 60 close to the second
substrate 50 should not interfere with the first electrodes 401.
Alternatively, there are no overlapping areas between the first
connecting electrodes 80 and the first electrodes 401 in a
thickness direction of the electronic paper display screen.
Further, the first connecting electrodes 80 and the second
electrodes 601 may be formed simultaneously.
[0068] It may be noted that when the plurality of first electrodes
401 are electrically connected with each other through the first
connecting electrodes 80, the voltages of the plurality of first
electrodes 401 are the same, thus, the first electrodes 401 are
equivalent to common electrodes, and the movement of the black
charged particles 70 in each of the closed chambers is controlled
by controlling the voltage of the second electrode 601 in each of
the closed chambers so as to achieve the black state display or the
white state display. For example, taking the black charged
particles 70 being positively charged as an example, when the
voltages of the plurality of first electrodes 401 are 3V, if the
voltage of the second electrode 601 in a closed chamber is 1V, the
black charged particles 70 move towards the second electrode 601;
if the voltage of the second electrode 601 in a closed chamber is 5
V, the black charged particles 70 move towards the first substrate
40. Similarly, when the plurality of second electrodes 601 are
electrically connected with each other through the first connecting
electrode 80, the voltages of the plurality of second electrodes
601 are the same, thus the second electrodes 601 are equivalent to
common electrodes, and the movement of the black charged particles
70 in each of the closed chambers is controlled by controlling the
voltage of the first electrode 401 located at the position
corresponding to each of the closed chambers so as to achieve the
black state display or the white state display.
[0069] In the embodiment of the present disclosure, when the
plurality of first electrodes 401 are electrically connected with
each other through the first connecting electrodes 80, if any one
of the first electrodes 401 is applied with a voltage, all the
first electrodes 401 have a same voltage, which reduces the number
of voltage input terminals and simplifies a manufacturing process
thereof compared with a case where the plurality of first
electrodes 401 are respectively applied with a voltage. Similarly,
when the plurality of second electrodes 601 are electrically
connected with each other through the first connecting electrodes
80, if any one of the second electrodes 601 is applied with a
voltage, all the second electrodes 601 have a same voltage, which
reduces the number of voltage input terminals and simplifies a
manufacturing process thereof compared with a case where the
plurality of second electrodes 601 are respectively applied with a
voltage.
[0070] Alternatively, as shown in FIG. 4, the second substrate 50
comprises a plurality of transparent third electrodes 501, each of
which is located at a position corresponding to each of the closed
chambers.
[0071] As shown in FIG. 4, the second substrate 50 may comprise a
second base substrate 502 on which the plurality of transparent
third electrodes 501 are disposed.
[0072] Here, each of the third electrodes 501 is located at a
position corresponding to each of the closed chambers, taking a
placement orientation of the electronic paper display screen in
FIG. 4 as an example, that is, each of the third electrodes 501 is
located below each of the closed chambers. Here, a projection of
each of the third electrodes 501 on the second base substrate 502
may or may not overlap with a projection of each of the insulating
barrier walls 60 on the second base substrate 502.
[0073] It may be noted that, there is no limit about how to control
the electric field generated by the first electrode 401, the second
electrode 601, and the third electrode 501 to control the movement
of the black charged particles 70 in the closed chamber so as to
enable the closed chamber to achieve the black state display or the
white state display. Several specific embodiments are provided
below for a detailed description.
[0074] When the closed chamber achieves a black state display, in a
first embodiment, no voltage is applied to the second electrode
601, the electric field generated by the first electrode 401 and
the third electrode 501 controls the movement of the black charged
particles 70 towards the first substrate 40 or the second substrate
50; in a second embodiment, no voltage is applied to the third
electrode 501, the electric field generated by the first electrode
401 and the second electrode 601 controls the movement of the black
charged particles 70 towards the first substrate 40; in a third
embodiment, no voltage is applied to the first electrode 401, the
electric field generated by the second electrode 601 and the third
electrode 501 controls the movement of the black charged particles
70 towards the second substrate; in a fourth embodiment, voltages
are applied to all of the first electrode 401, the second electrode
601, and the third electrode 501, respectively, the voltage applied
to the first electrode 401 is higher than the voltage applied to
the second electrode 601, the voltage applied to the second
electrode 601 is higher than the voltage applied to the third
electrode 501, or the voltage applied to the third electrode 501 is
higher than the voltage applied to the second electrode 601, the
voltage applied to the second electrode 601 is higher than the
voltage applied to the first electrode 401.
[0075] When the closed chamber achieves the white state display, in
a first embodiment, no voltage is applied to the third electrode
501, the electric field generated by the first electrode 401 and
the second electrode 601 controls the movement of the black charged
particles 70 towards the second electrode 601; in a second
embodiment, no voltage is applied to the first electrode 501, the
electric field generated by the second electrode 601 and the third
electrode 501 controls the movement of the black charged particles
70 towards the second electrode 601; in a third embodiment,
voltages are applied to all of the first electrode 401, the second
electrode 601, and the third electrode 501 respectively, when the
black charged particles are positively charged, the voltage applied
to the first electrode 401 is higher than the voltage applied to
the third electrode 501, the voltage applied to the third electrode
501 is higher than the voltage applied to the second electrode 601,
when the black charged particles are negatively charged, the
voltage applied to the second electrode 601 is higher than the
voltage applied to the third electrode 501, the voltage applied to
the third electrode 501 is higher than the voltage applied to the
first electrode 401.
[0076] In the embodiment of the present disclosure, the second
substrate 50 comprises a third electrode 501, since the third
electrode 501 may also form an electric field with the first
electrode 401 and the second electrode 601, the movement of the
black charged particles 70 may be accelerated to improve a response
speed of the electronic paper display screen.
[0077] Further optionally, as shown in FIG. 5, in a case where the
plurality of first electrodes 401 are independent of each other,
the second substrate 50 further comprises second connecting
electrodes 503 electrically interconnecting the plurality of third
electrodes 501, respectively.
[0078] The second connecting electrodes 503 and the third
electrodes 501 may be disposed on the second base substrate 502. On
the basis of this, the second connecting electrodes 503 and the
third electrodes 501 may be formed simultaneously.
[0079] Here, the plurality of first electrodes 401 being
independent of each other means that the plurality of first
electrodes 401 are not electrically connected with each other, and
different voltages may be applied to the plurality of first
electrodes 401, respectively.
[0080] It may be noted that when the plurality of first electrodes
401 are independent of each other and the plurality of third
electrodes 501 are electrically connected with each other through
the second connection electrodes 503, the plurality of second
electrodes 601 may be electrically connected with each other
through the first connecting electrodes 80, or the plurality of
second electrodes 601 may also be independent of each other.
[0081] Based on the above, when the plurality of third electrodes
501 are electrically connected with each other through the second
connecting electrodes 503 and the plurality of second electrodes
601 are electrically connected with each other through the first
connecting electrode 80, the voltages of the plurality of third
electrodes 501 are the same and the voltages of the plurality of
second electrodes 601 are the same, and the third electrodes 501
and the second electrodes 601 are equivalent to the common
electrodes, and the movement of the black charged particles 70 in
each of the closed chambers may be controlled by controlling the
voltage of the first electrode 401 corresponding to each of the
closed chambers so as to achieve the black state display or the
white state display. Taking the black charged particles 70 being
positively charged as an example, the common voltage of the
plurality of third electrodes 501 is V2, the common voltage of the
plurality of second electrodes 601 is V1, V2 is higher than V1, and
the potentials of the plurality of independent first electrodes 401
are switched between V0 and V3, where V0 is lower than V1, and V3
is higher than V2. Then, according to the foregoing principle of
achieving the black state display or the white state display, the
black charged particles 70 will move back and forth between the
first electrode 401 and the second electrode 601 to achieve
switching of the black state display or the white state display.
When the plurality of third electrodes 501 are electrically
connected with each other through the second connecting electrodes
503, the voltages of the plurality of third electrodes 501 are the
same, the third electrode 501 is equivalent to the common
electrode, and the plurality of second electrodes 601 are
independent of each other and the plurality of first electrodes 401
are independent of each other, and the movement of the black
charged particles 70 in each of the closed chambers may be
controlled by controlling the voltage(s) of the second electrodes
601 and/or the first electrodes 401 corresponding to each of the
closed chambers so as to achieve the black state display or white
state display. For example, the black charged particles 70 are
positively charged, and voltages are applied to the first electrode
401, the second electrode 601 and the third electrode 501
respectively, the common voltage of the plurality of third
electrodes 501 is V0, and the voltages of the plurality of first
electrodes 401 are switched between V1 and V2, the voltages of the
plurality of second electrodes 601 are switched between V3 and V4.
For example, when the voltage of the first electrode 401 is V2, the
voltage of the second electrode 601 is V3, when the voltage of the
first electrode 401 is V1, the voltage of the second electrode 601
is V4, wherein V2 is greater than V0, V0 is greater than V1, V4 is
greater than V1 and less than V0, and V3 is less than V0 and less
than V2, according to the principle of achieving the black state
display or white state display described above, the black charged
particles 70 will move back and forth between the first electrode
401 and the second electrode 601 to achieve switching of the black
state display or the white state display. For example, when the
voltage of the first electrode 401 is V2, the voltage of the second
electrode 601 is V3, and when the voltage of the first electrode
401 is V1, the voltage of the second electrode 601 is V4, and V1 is
greater than V0, V0 is greater than V2, V4 is less than V1 and
greater than V0, and V3 is less than V0 and less than V2. According
to the principle of achieving the black state display or the white
state display, the black charged particles 70 will move back and
forth between the third electrode 501 and the second electrode 601
so as to achieve the switching of the black state display or the
white state display.
[0082] In the embodiment of the present disclosure, since the
plurality of third electrodes 501 are electrically connected with
each other through the second connecting electrode 503, therefore,
if any one of the third electrodes 501 is applied with a voltage,
all the third electrodes 501 have the same voltage, which reduces
the number of voltage input terminals and simplifies a
manufacturing process thereof compared with a case where the
plurality of third electrodes 501 are respectively applied with
voltages.
[0083] In the case where the black state display is achieved in two
adjacent closed chambers, respectively, if the material of the
insulating barrier walls 60 is a transparent material and there is
no light shielding pattern provided thereon, the light emitted by
the backlight assembly would exit from a region between the two
closed chambers, thereby causing a light leakage and adversely
affecting the display. Based on this, in the embodiment of the
present disclosure, alternatively, as shown in FIG. 6, the material
of the insulating barrier walls 60 is a light shielding material;
and/or the first substrate 40 or the second substrate 50 further
comprises a light shielding pattern 90, and a projection of each of
the insulating barrier walls 60 on the light shielding pattern 90
is located within the boundary of the light shielding pattern
90.
[0084] The projection of each of the insulating barrier walls 60 on
the light shielding pattern 90 being located within the boundary of
the light shielding pattern 90 may be a case where a projection of
a boundary of each of the insulating barrier walls 60 on the light
shielding pattern 90 may overlap with the boundary of the light
shielding pattern 90; or the boundary of the light shielding
pattern 90 surrounds the projection of the boundary of each of the
insulating barrier walls 60 on the light shielding pattern 90.
[0085] In the embodiment of the present disclosure, the material of
the insulating barrier walls 60 is provided as a light shielding
material, or the light shielding pattern 90 is provided so as to
prevent the light leakage occurring in the region between the two
adjacent closed chambers, thereby adversely affecting the
display.
[0086] Referring to FIG. 6, if the sidewall of the insulating
barrier walls 60 on which the second electrodes 601 are disposed is
perpendicular to the first substrate 40 or the second substrate 50,
the black charged particles 70 will be attracted to the sidewall of
the insulating barrier walls 60 by the second electrode 601 when
the closed chamber achieves the white state display, so that when
the backlight emitted by the backlight assembly passes through the
closed chamber, a part of the backlight may be blocked by the black
charged particles 70, thereby adversely affecting the brightness
when the white state is displayed.
[0087] Based on this, in the embodiment of the present disclosure,
further alternatively, as shown in FIG. 7, the sidewall of the
insulating barrier walls 60 on which the second electrodes 601 is
disposed is an inclined surface or an inwardly recessed
surface.
[0088] The sidewall of the insulating barrier walls 60 on which the
second electrodes 601 is disposed being an inclined surface means
that the sidewall is non-perpendicular or inclined with respect to
the first substrate 40 or the second substrate 50. The sidewall of
each of the insulating barrier walls 60 disposed with corresponding
one of the second electrodes 601 being an inwardly recessed surface
means that a surface of the sidewall is recessed towards an
interior of the sidewall.
[0089] In the embodiment of the present disclosure, since the
sidewall of the insulating barrier walls 60 on which the second
electrodes 601 is disposed is an inclined surface or an inwardly
recessed surface, the black charged particles 70 are attracted to
the inclined surface or the inwardly recessed surface when the
white state display is achieved, which reduces the risk of the
black charged particles 70 blocking the backlight such that the
backlight cannot exit from each of the closed chambers.
[0090] Optionally, the electronic paper display screen further
comprises a transparent liquid disposed within each of the closed
chambers; the black charged particles 70 may move in the
transparent liquid.
[0091] The transparent liquid in the closed chambers of the
embodiment of the present disclosure may be the same as the
transparent liquid in a microcapsule or a microcup in the
electronic paper display device in the related art. By way of
example, the transparent liquid may be tetrachloroethylene or
xylene.
[0092] In the embodiment of the present disclosure, the transparent
liquid is disposed in the closed chambers, so that the black
particles may be in a suspended state in the transparent liquid,
thereby reducing the influence of an external force, such as
gravity, on the black particles, thereby facilitating the movement
of the black charged particles 70, and improving the response speed
of the electronic paper display screen and avoiding afterimage
problems when the electronic paper display screen performing
display.
[0093] An embodiment of the present disclosure provides an
electronic paper display device, as shown in FIGS. 8a and 8b,
comprising the above-described electronic paper display screen 01
and the backlight assembly 02; the backlight assembly 02 comprises
a power supply module 100 and main light sources 110 connected to
the power supply module 100. The power supply module 100 is
configured to supply power to the main light sources 110 so that
the main light sources 110 provide the electronic paper display
screen 01 with backlight when being charged.
[0094] The power supply module 100 may be a battery or an AC
circuit.
[0095] Here, the backlight assembly 02 may be a side-lit backlight
assembly as shown in FIG. 8a or a direct-lit backlight assembly as
shown in FIG. 8b. As shown in FIG. 8a, when the backlight assembly
02 is a side-lit backlight assembly, the backlight assembly 02
comprises a light guide plate 120 and main light sources 110
disposed at a side of the light guide plate 120. In addition, the
backlight assembly 02 may further comprise an optical film 130
disposed on a side of the light guide plate 120 close to the
electronic paper display screen 01 and/or a reflective sheet 140
disposed on a side of the light guide plate 120 away from the
electronic paper display screen 01. The optical film 130 may be,
but not limited to, a diffusion sheet. As shown in FIG. 8b, when
the backlight assembly 02 is the direct-lit backlight assembly, the
backlight assembly 02 comprises a diffusion plate 150 and main
light sources 110 disposed on a side of the diffusion plate 150
away from the electronic paper display screen 01. Here, the main
light sources 110 may be disposed on a PCB (Printed Circuit
Board).
[0096] In addition, the main light sources 110 may be, for example,
LED (Light-Emitting Diode) lamps or Cold Cathode Fluorescent Lamps
(abbreviated as "CCFL").
[0097] An embodiment of the present disclosure provides an
electronic paper display device comprising an electronic paper
display screen 01 and a backlight assembly 02. The backlight
assembly 02 comprises a power supply module 100 and main light
sources 110 connected to the power supply module 100. The main
light sources 110 may provide backlight to the electronic paper
display screen 01 when the power supply module 100 is charged. When
the black charged particles 70 in the closed chamber move towards
the first substrate 40 under the effect of the electric field (as
shown in the closed chamber on the left side of FIG. 8a), thus the
black charged particles 70 block the backlight emitted by the
backlight assembly 02, and the backlight provided by the backlight
assembly 02 cannot be transmitted through the closed chamber to
enter the human eyes, thereby achieving the black state display;
when the black charged particles 70 in the closed chamber move
towards the second electrode 601 under the effect of the electric
field (as shown in the closed chamber on the right side of FIG.
8a), since the second electrode 601 is disposed on the sidewall of
the insulating barrier wall 60, the black charged particles 70 move
to the sidewall, in this way, the backlight provided by the
backlight assembly 02 may be incident into the human eyes through
the closed chamber so as to achieve the white state display. Since
the electronic paper display screen 01 of the electronic paper
display device is used in combination with the backlight assembly
02, the backlight assembly 02 is used to provide the backlight for
the electronic paper display screen 01, compared with the
electronic paper display screen in the related art emitting light
by a reflection of the external light on surfaces of the white
particles 301, the brightness and contrast of the electronic paper
display device provided by the embodiment of the present disclosure
are not adversely affected by the external light when the
electronic paper display device perform a display, and the
electronic paper display device may normally perform a display when
the external light is not sufficient or an external environment is
dark.
[0098] Optionally, the power supply module 100 comprises a
photoelectric conversion component configured to absorb the
external light and convert the absorbed external light into
electrical energy to supply power to the main light sources
110.
[0099] The photoelectric conversion component serves as a solar
battery.
[0100] In the embodiment of the present disclosure, since the power
supply module 100 comprises a photoelectric conversion component
which absorbs the external light and converting the absorbed
external light into electrical energy to supply power to the main
light sources 110, thereby achieving a purpose of power saving.
[0101] Optionally, as shown in FIG. 9, the backlight assembly 02
further comprises at least one auxiliary light source 160, which
comprises an optical collector 1601 and an optical transmission
channel 1602. The optical collector 1601 is disposed at an entrance
of the optical transmission channel 1602 for concentrating and
transmitting the external light into the optical transmission
channel 1602. The optical transmission channel 1602 is configured
to transmit an external light entering entrance of the optical
transmission channel 1602 to an exit of the optical transmission
channel 1602.
[0102] The optical collector 1601 is also called an optical
concentrator, and is composed of an aperture and a condenser. The
condenser comprises one or more lenses, and serves to concentrate
the light.
[0103] Here, a structure of the optical transmission channel 1602
is not limited as long as the optical transmission channel 1602 may
transmit the light entering the entrance of the optical
transmission channel 1602 to the exit of the optical transmission
channel 1602. Structures of three kinds of optical transmission
channels 1602 are provided below.
[0104] The first kind of optical transmission channel 1602 is a
fiber tube.
[0105] The second kind of optical transmission channel 1602 is a
one-dimensional defect photonic transistor.
[0106] The third kind of optical transmission channel 1602
comprises a transmission tube and a reflective layer disposed
within the transmission tube.
[0107] Based on this, the position where the auxiliary light source
160 is arranged is related to the type of the backlight assembly
02. Specifically, when the backlight assembly 02 is a side-lit
backlight assembly, the light emitted by the auxiliary light source
160 should be incident on the side surface of the light guide plate
120, thus, a light exit of the auxiliary light source 160 is
located on the side surface of the light guide plate 120, and the
auxiliary light source 160 may also be disposed on the side surface
of the light guide plate 120. Since the main light sources 110 are
also disposed on the side surface of the light guide plate 120, the
main light sources 110 and the auxiliary light source 160 may be
disposed on one same side surface or different side surfaces of the
light guide plate 120. When the main light sources 110 and the
auxiliary light source 160 are disposed on one same side surface of
the light guide plate 120, the main light sources 110 and the
auxiliary light source 160 may be disposed in a thickness direction
of the light guide plate 120, taking the displacement orientation
of the electronic paper display device shown in FIG. 8a as an
example, the main light sources 110 and the auxiliary light source
160 are disposed on the side surface of the light guide plate 120,
and one is on the other. In addition, when the backlight assembly
02 is a side-lit backlight assembly, further alternatively the
embodiment of the present disclosure comprises at least one row of
auxiliary light sources 160 arranged in a length direction of a
side surface of the light guide plate 120. When the backlight
assembly 02 is a direct-lit backlight assembly, the auxiliary light
source 160 is disposed on a side of the diffusion plate 150 away
from the electronic paper display screen 01. On the basis of this,
in the embodiment of the present disclosure, alternatively, the
backlight assembly 02 comprises a plurality of auxiliary light
sources 160, the auxiliary light sources 160 and the main light
sources 110 may be alternately and evenly distributed on a side of
the diffusion plate 150 away from the electronic paper display
screen 01.
[0108] It may be noted that the side surface of the light guide
plate 120 refers to a surface other than a light-emitting surface
of the light guide plate 120 and a surface opposite to the
light-emitting surface.
[0109] The electronic paper display device provided by the
embodiment of the present disclosure further comprises auxiliary
light sources 160 which provide backlight for the electronic paper
display screen 01 together with the main light sources 110. Since
the auxiliary light source 160 supplies the concentrated external
light to the electronic paper display screen 01 as backlight, thus
achieving a purpose of saving power.
[0110] Further alternatively, as shown in FIG. 10, the auxiliary
light source 160 further comprises: a diffuse reflector 1603
disposed at the exit of the light transmission channel 1602.
[0111] In the embodiment of the present disclosure, the diffuse
reflector 1603 is disposed at the exit of the light transmission
channel 1602 to ensure that the light emitted by the auxiliary
light source 160 is uniform.
[0112] Since the display side is usually arranged upward when the
electronic paper display device is in use, if a concentrating port
of the optical collector 1601 for concentrating external light
faces away from the display side, the optical collector 1601
collects less external light, thus, an intensity of the light
emitted by the auxiliary light source 160 is weak. Based on this,
in the embodiment of the present disclosure, alternatively, the
concentrating port of the optical collector 1601 for concentrating
the external light is directed towards the display side of the
electronic paper display device, so that the optical collector 1601
may advantageously absorb more external light and the brightness of
the light emitted from the auxiliary light source 160 is
improved.
[0113] It may be noted that the display side of the electronic
paper display device refers to a light exit side of the electronic
paper display device, that is, the side on which the display
surface of the electronic paper display device is located.
[0114] Alternatively, the backlight assembly 02 further comprises a
photosensitive module configured to sense the intensity of the
external light or configured to sense an intensity of the external
light concentrated by the auxiliary light source 160; and a control
module configured to control the power supplied by the power supply
module 100 based on the intensity of the external light sensed by
the photosensitive module.
[0115] It may be noted that the control module is configured to
control the power provided by the power supply module 100 according
to the intensity of the external light sensed by the photosensitive
module. It may be that, when the intensity of the external light
sensed by the photosensitive module is higher than a certain
threshold, the control module controls the power supply module 100
to be shut down and only the auxiliary light source 160 provides
backlight for the electronic paper display screen 01; when the
intensity of the external light sensed by the photosensitive module
is lower than a certain threshold, the control module controls the
power supply module 100 to be turned on so as to provide the main
light sources 110 with power, thus the auxiliary light source 160
and the main light sources 110 collectively provide backlight for
the electronic paper display screen 01. When the control module
controls the power supply module 100 to provide power to the main
light sources 110, the power provided by the power supply module
100 may be a certain value, that is, the brightness of the light
emitted by the main light sources 110 is constant; or the power
provided by the power supply module 100 may be associated with the
intensity of the external light sensed by the photosensitive
module, the greater the intensity of the external light sensed by
the photosensitive module, the smaller the power provided by the
power supply module 100, that is, the smaller the brightness of the
light emitted by the main light sources 110, the smaller the
intensity of the external light sensed by the photosensitive
module, the greater the power provided by the power supply module
100, that is, the greater the brightness of the light emitted by
the main light sources 110.
[0116] In the embodiment of the present disclosure, the backlight
module 02 further comprises a photosensitive module and a control
module. Since the control module may control the electric power
provided by the power supply module 100 according to the intensity
of the external light sensed by the photosensitive module, the main
light sources 110 and the auxiliary light source 160 may be
controlled to appropriately cooperate with each other, so that the
brightness of the light emitted by the backlight assembly 02 is
neither too bright nor too dark, which improves the user experience
to the electronic paper display device.
[0117] The embodiment of the present disclosure further provides a
method for driving the electronic paper display screen, as shown in
FIG. 11.
[0118] S100. In a case where an electric field configured to drive
a movement of the black charged particles 70 in each of the closed
chambers is generated by the first electrode 401 and the second
electrode 601 in each of the closed chambers, the driving method
comprising steps of: applying voltages to the first electrode 401
and the second electrode 601, and controlling the black charged
particles 70 to move towards the first substrate 40 through the
electric field generated by the first electrode 401 and the second
electrode 601 so as to enable each of the closed chambers to
display a black state, or controlling the black charged particles
70 to move towards the second electrode 601 so as to enable each of
the closed chambers to display a white state.
[0119] It may be noted that, a moving direction of the black
charged particles 70 in each of the closed chambers is related to a
direction of the electric field that drives the black charged
particles 70 to move in each of the closed chambers and positivity
or negativity of charges of the black charged particles 70. Taking
the black charged particles 70 being positively charged as an
example, if the voltage applied to the first electrode 401 is
higher than the voltage applied to the second electrode 601, the
direction of the electric field is directed from the first
electrode 401 to the second electrode 601, the black charged
particles 70 move towards the second electrode 601; if the voltage
applied to the first electrode 401 is lower than the voltage
applied to the second electrode 601, the direction of the electric
field is directed from the second electrode 601 to the first
electrode 401, the black charged particles 70 move towards the
first substrate 40. When the black charged particles 70 are
negatively charged, voltages are applied to the first electrode 401
and the second electrode 601 respectively such that the direction
of the electric field generated by the first electrode 401 and the
second electrode 601 is opposite to that when the black charged
particles 70 are positively charged, which is not repeated
here.
[0120] In a case where an electric field configured to drive a
movement of the black charged particles in each of the closed
chambers is generated by the first electrode 401, the second
electrode 601 and the third electrode 501 in each of the closed
chambers, the driving method comprising steps of: controlling a
direction of the electric field configured to drive a movement of
the black charged particles 70 in each of the closed chambers by
controlling voltages of the first electrode 401, the second
electrode 601 and the third electrode 501, so as to drive the black
charged particles 70 to move towards the first substrate 40 or the
second substrate 50, such that each of the closed chambers displays
a black state, or to drive the black charged particles 70 to move
towards the second electrode 601 such that each of the closed
chambers displays a white state.
[0121] There is no limit about how to control the electric field
generated by the first electrode 401, the second electrode 601, and
the third electrode 501 to control the movement of the black
charged particles 70 in the closed chamber so as to enable the
closed chamber to achieve the black state display or the white
state display. Several specific embodiments are provided below for
a detailed description.
[0122] When the closed chamber achieves a black state display, in a
first embodiment, no voltage is applied to the second electrode
601, the electric field generated by the first electrode 401 and
the third electrode 501 controls the movement of the black charged
particles 70 towards the first substrate 40 or the second substrate
50; in a second embodiment, no voltage is applied to the third
electrode 501, the electric field generated by the first electrode
401 and the second electrode 601 controls the movement of the black
charged particles 70 towards the first substrate 40; in a third
embodiment, no voltage is applied to the first electrode 401, the
electric field generated by the second electrode 601 and the third
electrode 501 controls the movement of the black charged particles
70 towards the second substrate; in a fourth embodiment, voltages
are applied to all of the first electrode 401, the second electrode
601, and the third electrode 501, respectively, the voltage applied
to the first electrode 401 is higher than the voltage applied to
the second electrode 601, the voltage applied to the second
electrode 601 is higher than the voltage applied to the third
electrode 501, or the voltage applied to the third electrode 501 is
higher than the voltage applied to the second electrode 601, the
voltage applied to the second electrode 601 is higher than the
voltage applied to the first electrode 401.
[0123] When the closed chamber achieves the white state display, in
a first embodiment, no voltage is applied to the third electrode
501, the electric field generated by the first electrode 401 and
the second electrode 601 controls the movement of the black charged
particles 70 towards the second electrode 601; in a second
embodiment, no voltage is applied to the first electrode 501, the
electric field generated by the second electrode 601 and the third
electrode 501 controls the movement of the black charged particles
70 towards the second electrode 601; in a third embodiment,
voltages are applied to all of the first electrode 401, the second
electrode 601, and the third electrode 501 respectively, when the
black charged particles are positively charged, the voltage applied
to the first electrode 401 is higher than the voltage applied to
the third electrode 501, the voltage applied to the third electrode
501 is higher than the voltage applied to the second electrode 601,
when the black charged particles are negatively charged, the
voltage applied to the second electrode 601 is higher than the
voltage applied to the third electrode 501, the voltage applied to
the third electrode 501 is higher than the voltage applied to the
first electrode 401.
[0124] The embodiment of the present disclosure provides a method
for driving an electronic paper display screen, which has same
features and beneficial effects as the electronic paper display
screen provided by the above embodiments, since the structures and
beneficial effects of the electronic paper display screen are
described in detail in the above embodiments, and thus will not be
described again here.
[0125] Embodiments of the present disclosure provide an electronic
paper display screen, a method for driving the same, and an
electronic paper display device. Since the electronic paper display
screen controls the direction of the electric field that drives the
black charged particles in each of the closed chambers to move so
as to control the movement of the black charged particles in each
of the closed chambers, a purpose of controlling each of the closed
chambers to achieve a black state display or a white state display
is fulfilled. When the black charged particles in the closed
chamber move towards the first substrate under the effect of the
electric field, in this way, the black charged particles block the
light emitted from the backlight assembly. Thus, the backlight
provided by the backlight assembly fails to be incident into the
human eyes through the closed chamber and a black state display is
achieved; when the black charged particles in the closed chamber
move towards the second electrode under the effect of the electric
field, since the second electrode is disposed on the sidewall of
the insulating barrier wall, the black charged particles move to
the sidewall, in this way, the backlight provided by the backlight
assembly may be incident into the human eyes through the closed
chamber and a white state display is achieved. Since the electronic
paper display screen is used in combination with the backlight
assembly, the backlight assembly is used to provide the backlight
for the electronic paper display screen, compared with the
electronic paper display screen in the related art emitting light
by a reflection of the external light on surfaces of the white
particles, the brightness and contrast of the electronic paper
display device provided by the embodiment of the present disclosure
are not adversely affected by the external light when the
electronic paper display device perform a display, and the
electronic paper display device may normally perform a display when
the external light is not sufficient or an external environment is
dark.
[0126] The above description is only some specific embodiments of
the present disclosure, although the scope of the present
disclosure is not limited thereto. Those skilled in the art may
easily envisage modifications or substitutions within the technical
scope of the disclosure, which may fall within a protective scope
of the present disclosure. Therefore, the protective scope of the
present disclosure should be defined by the scope of the
claims.
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